Shop Shrouded Fable booster boxes, Elite Trainer Boxes, and more at The Trainer Court
If it's a character card, they may put it into their hand
It lets all your little tokens get a huge spike in power, even without Isshin doubling the effect
For a Planeswalker to be your commander, it needs to explicitly say so on the card
Note that the issues with playing this in paper is having to note down the dragons you draw to keep track of the bonus (and likely having to reveal it), and the time it takes to pick a random number between the dragons left in the deck (which can be made easier if you remember the total amount of dragons left, count how many is not in the deck, and choosing a random number before digging through the deck
Fans are already hoping for an adorable SAR artwork of her baking donuts with Hoopa